Home / 13,121.81-18,108.20-7,744.35

Finding the Fourth Proportional to 13,121.81, 18,108.20 and 7,744.35

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Solution

The fourth proportional to 13,121.81, 18,108.20 and 7,744.35 is: 10,687.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.81 : 18,108.20 = 7,744.35 : x
  2. Step 2: Convert to fraction form
    13,121.81/18,108.20 = 7,744.35/x
  3. Step 3: Cross multiply
    13,121.81x = 18,108.20 × 7,744.35
  4. Step 4: Simplify right side
    13,121.81x = 140,236,199.95
  5. Step 5: Solve for x
    x = 140,236,199.95/13,121.81
  6. Step 6: Final answer
    x = 10,687.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.